Looks like Trimble and Cisco got together on a PPS implementation for
the 7200, starting with 12.0T trainwreck:
http://www.cisco.com/en/US/docs/ios/12_1t/12_1t1/feature/guide/dtrimble.html
Since I don't have any 7200s any longer (thank goodness), I checked
and it seems that the 6500s support this as well on the console serial
port:
6509-rtr(config-line)#ntp ?
pps-discipline Use PPS pulse to discipline system clock
refclock NTP Reference Clock
and
6509-rtr(config-line)#ntp refclock ?
telecom-solutions Telecom Solutions GPS
trimble Trimble Navigation TSIP Protocol
It looks interesting, and if the code is just looking for a PPS
transition on the CTS or RI, you might be in luck with any external
PPS...
BUT be forewarned, IOS is a cooperative multitasking operating system
(at least prior to the new "modular" stuff), so your accuracy is going
to vary depending on loads, processes, etc. I wouldn't count on this
being to spectacular... probably no better than an external NTP
source.
And of course, you can always call the TAC for more assistance! ;-)
73,
Dave
AF6KD
On Fri, Oct 3, 2008 at 2:39 PM, Robert Vassar <rvassar at rob-vassar.com> wrote:
>>>> I've been fiddling around with an old Cisco router here at the house
> to brush up. We have an IPv6 project going at work, and our WAN
> provider provides no native transit, so I'm looking at doing some
> tunneling. Anyhow... I discovered IOS 12.1 and above have native NTP
> capability. I don't have the exhaustive IOS command reference, and I
> suspect it's a limited NTP implementation. I'm wondering if it's
> possible to tie a GPS unit to a router serial port and gain a stratum
> 0 refclock.
>>> Any Cisco guru's on the list? :-)
>>>> Cheers,
>> Rob
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